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Improved deep desulphurisation of middle distillates by a two-phase reactor with pre-saturater

机译：带有预饱和器的两相反应器改善了中间馏分的深度脱硫

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摘要

Hydrodesulphurisation (HDS) of middle distillates is up to now performed in trickle bed reactors equipped with an expensive H_2-recycle. To meet future low Slimits, hydrotreating of already pre-desulphurised oils is needed. The H_2-supply is then far beyond what is chemically consumed. In addition, conventional three-phase HDS-reactors are generally problematic with respect to mass transfer, hydrodynamics, and therefore, scale-up. In this paper, an improved HDS-concept based on a two-phase reactor is discussed. The oil is thereby externally saturated with H_2 and only the liquid is passed over the fixed bed. This concept was proven by experiments with light fuel oils (582 and 2252 ppm S, CoMo-catalyst, 1-6 MPa, 330-400 deg C, up to 100 days continuous operation). In addition, kinetic studies were done with model oil consisting of a mixture of n-dodecane and selected Sspecies such as di-, tri- and tetra-methyl-dibenzothiophenes. In case of the presented two-phase concept, the Hirecycle is redundant, the intrinsic reaction rate can be utilised (and accurately measured), and scale-up problems do not occur.
机译：到目前为止，中间馏分的加氢脱硫（HDS）在配备了昂贵的H_2循环的滴滤床反应器中进行。为了满足未来的低限值，需要对已经预脱硫的油进行加氢处理。这样，H_2的供应量远远超过化学消耗量。另外，常规的三相HDS反应器通常在传质，流体动力学和因此放大方面存在问题。本文讨论了一种基于两相电抗器的改进的HDS概念。因此，油在外部被H_2饱和，只有液体通过固定床。通过使用轻质燃油（582和2252 ppm S，CoMo催化剂，1-6 MPa，330-400℃，连续运行100天）的实验证明了这一概念。此外，还用模型油进行了动力学研究，模型油由正十二烷和选定的物种（例如二甲基，三​​甲基和四甲基-二苯并噻吩类）的混合物组成。在提出的两阶段概念的情况下，Hirecycle是多余的，可以利用（准确测量）固有的反应速率，并且不会出现放大问题。

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